181 H
Interrupt condition target setting range error
Mitsubishi Electric · MELSEC iQ-R I/O Module
What does 181 H mean?
An invalid value has been configured for 'Interrupt condition target setting [n]'. For an input module, the setting is outside the range of 0 to 3 and 7 to 10. For an output module, the setting is outside the range of 0 to 4 and 7. This prevents proper interrupt handling.
Common Causes
- Incorrect value (outside 0-3, 7-10) set for 'Interrupt condition target setting [n]' on an input module.
- Incorrect value (outside 0-4, 7) set for 'Interrupt condition target setting [n]' on an output module.
Repair Steps & Checklist
Click steps to track your progress.
- 1
For an input module, set 'Interrupt condition target setting [n]' to a value between 0 and 3 or between 7 and 10.
- 2
For an output module, set 'Interrupt condition target setting [n]' to a value between 0 and 4 or to 7.
- 3
Refer to page 93 of the manual for detailed information on 'Interrupt condition target setting [n]'.
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC iQ-R I/O Module